Diaphragm valve



JmL?, 1941. P K z SAUNDERS 2,227,914

A DIAPHRAGM vLvE Filed July 19, 1939 www "fle/V ATTORN EY ,Patented Jan.7, 1941 PATENT OFFICE 2,227,914 DIAPHRAGM VALVE Philip Keith Saundes,

Cwmbran, near Newport, ngland Appiioation Joiyis, 1939, sonal No.285,430 In Great Britain August 15, 1938 v claims. (01."251-24) Thisinvention relates to diaphragm valves. In particular the invention isconcerned with that kind of valve in which the body has a. substantiallystraight through bore lntersected by a shallow weir which forms aseating for the diaphragm whose periphery is clamped between thecircumferential iiange of an opening in the side of the body oppositeythe Weir and a casingor bonnet which accommodates the valve actuatinggear. A

A principal object of the invention is to provide a simple operatingmechanism which may be used on practically all sizes of valves both forquick acting and also for .power operated valves.

A further object is to provide a convenient method 4of adjusting thelimiting positions of quick acting valves without dissembling the valveoperating mechanism.

With these and other objects in view according to this invention thediaphragm is movedby a connecting rod controlled by a crank or eccentricrotating about an axis parallel with the plane of attachment of thediaphragm; -that is to say, parallel with the plane or" thecircumferential flange g5 surrounding the opening in the side of thebody across which thediaphragm is mounted.

Further features of the invention will become apparent from the detaileddescription of one embodiment thereof illustrated in the accompanyingdrawing in which:

llig. 1 is a side elevation 4in section of a quick acting `diaphragmvalve in accordance with the invention. V

Fig. 2 is a section on the line Il-II oi Fig. l.

The body l oi .the valve illustrated has the usual Weir 2 intersectingthe bore and having a concave face to form a seating for the diaphragm 3which is clamped across an opening in the side of the body by the bonnetd.

The bonnet il has the usual diaphragm sup porting toes 5 cast in it. Thediaphragm tis attached by the usual stud t to a diaphragm compressor ihaving the usualprojecting iinger inter-engaging'with the 4toes 5. Thetwo long iin- 5 gers 8 in the plane of the weir i have thickened ends 49which engage .diametrically opposite grooves ID inthe sides oi thebonnet'.

A shaft il in the plane of the weir 2 and lparallel with the plane ofattachment of the diaphragm 3 is journalled in the bonnet. An eccentric!2 is mounted on a square part i3 of the shaft. An integral eccentricstrap and connect,

ing rod iii has a .ball end I5 which co-acts with a longitudinally splitcylindrical ball socket I6 diiv screwed centrally into the compressor l.The

ball socket I6 has av plurality of radial holes l1 which are accessibleby removing the .plug I8 in the side of the bonnet d.

The eccentric strap ifi is held on the' eccentric Al2 by a U shaped partI9 attached by a screw 5 20 to the top of the strap it so that its armsoverlap the eccentric on each side.

The shaft H has a collar 2l secured on one end by a pin 22. Theoperating handle 23 is` mounted on `a squared part 26 on the other end10 and secured by a clamping handle 25 screwed on to the threadedend 26of the shaft.

A grease gun nipple 21 is provided for lubricating the bearings of theshaft il and the bearing between the eccentric l2 and its strap iii. l5

Movement of the handle 2.3 is limited by contact between one or other othe lugs 28 on it with the stop 29 on =the bonnet. These lugs arearranged so that the eccentric is just past bottom dead centre when thehandle is in the valve closing position. The ball joint is adjusted byremoving the .plug I8 and rotating the ball socket i6 by means of atommy bar in the holes il until a tight closure is made with the valveclosed. The ball joint may be locked in this position by 25 the grubscrew 30 threaded radially in the boss of the compressor 'l opposite theplug it.

The diaphragm will be suiiiciently compressible to allow the eccentricto be moved over bottom so dead centre position to allow the operatinghanaio to bo moved .to the muy closed` position. In

. this position pressure on the diaphragm of the fluid controlled `in noway tends to 'open the valve. 35

The valve may be held in any desired position intermediate the full openand full closed positions by screwing up the clamping handle 2E.

, Due to the thickened ends 9 of the ngers d on the diaphragm compressorthere is no possio bility of the'latter member becoming jammed in thebonnet on account of the oblique thrust exerted on it by the connectingrod in certain positions.

What I claim is:

1. A diaphragm valve comprising a body with a substantially straightthrough bore intersected by a raised weir and having an opening oppositethe Weir, a diaphragm extending across the open-v ing, a bonnet disposedabove said diaphragm, a 50 backing member for actuating the diaphragm, acrank shaft in the plane of the Weir and parallel with the plane ofattachment of the diaphragm journalled in said bonnet, and a connectingrod connected at one end to the crank and at the other end by a balljoint to the backing member.

2. A diaphragm valve comprising 'a body with a substantially straightthrough bore intersected by a raised Weir and having an opening oppositethe Weir, a diaphragmI extending across the opening, a bonnet disposedabove said diaphragm, a backing member for actuating the diaphragm, ashaft in the plane of the weir and parallel with the plane of attachmentof the diaphragm journalled in said bonnet, an eccentric on said.shaftan, veccentricstrap surrounding said eccentric, and a connecting rodconnected at one end'to the eccentric strap and at the other end by aball joint to the backing member.

3. In a quick acting diaphragm valve, a diaphragm seating, a' diaphragm,a diaphragm backing member, alever operated shaft, an eccentric on saidshaft, an eccentricstrap surrounding said eccentric, a-connecting rodfrom the eccentric strap to said Vbacking member proportioned so thatsaid diaphragm is pressed into tight contact with said Weirv in thebottom dead centre position, and an abutment stop limiting movethe endremote from'. theball to the crank, and

an external1y threaded longitudinally split cylindrical ball socketco-acting with the ball end of the connecting rod screwed into saidbacking member.

5. In an eccentric operated diaphragm valve,

-a backing member with a central threaded hole on the side remote fromthe diaphragm, an eccentric shaft, a ball ended connecting rod with anintegral eccentric strap at the end remote from the ball co-acting withsaid eccentric, and an externallythreaded longitudinally splitcylindrical ball socket co-acting-With the ball end of said connectingrod screwed into said backing member.

PHILIP KEITH SAUNDERS.

